I see a lot of writing that includes all sorts of four-syllable words, complex punctuation, and language that's supposed to sound very impressive--what light through yonder window breaks kind of stuff. It worked for Shakespeare because he's, well, Shakespeare. You're not. I'm not either and we don't communicate that way anymore. Long words, Latin-esque phrases, and sentences broken up with unnecessary random bits interrupt my journey as a reader, making my eyes trip and tying my brain up in knots. I have to work too hard to read them and in a lot of cases, I just won't. Writing nobody wants to read isn't very useful.
Instead of trying to use big, impressive words and sound like a Ph.D. thesis, try to write like you talk. Do you use those words in regular conversation? If not, they're probably not great for conversations on paper, which is really what good written communication is. Does your writing sound like you? Can you hear yourself talking when you read it? If not (and if it's not actually a Ph.D. thesis), rethink it. Pare it down. Use real words and phrases that seem natural to you--if the process of writing feels stilted, the process of reading it will be, too.